2 Fe2O3 (s) → 4 Fe (s) + 3 O2 (s) ∆H = -97.0 kJ/mol Fe2O3, determine the mass of iron produced if the reaction yields 254 kJ of heat energy.

first one is the correct answer

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

the awnser is group 12

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.